JP6507764B2 - Tapered roller bearings - Google Patents

Tapered roller bearings Download PDF

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Publication number
JP6507764B2
JP6507764B2 JP2015059504A JP2015059504A JP6507764B2 JP 6507764 B2 JP6507764 B2 JP 6507764B2 JP 2015059504 A JP2015059504 A JP 2015059504A JP 2015059504 A JP2015059504 A JP 2015059504A JP 6507764 B2 JP6507764 B2 JP 6507764B2
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tapered roller
small diameter
diameter annular
annular portion
small
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JP2016180417A (en
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敦 長井
敦 長井
賢一 尾野
賢一 尾野
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JTEKT Corp
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JTEKT Corp
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Priority to JP2015059504A priority Critical patent/JP6507764B2/en
Priority to DE102016105110.1A priority patent/DE102016105110A1/en
Priority to US15/075,784 priority patent/US9683599B2/en
Priority to CN201610160767.XA priority patent/CN105987075B/en
Publication of JP2016180417A publication Critical patent/JP2016180417A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C19/00—Bearings with rolling contact, for exclusively rotary movement
    • F16C19/22—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings
    • F16C19/34—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings for both radial and axial load
    • F16C19/36—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings for both radial and axial load with a single row of rollers
    • F16C19/364—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings for both radial and axial load with a single row of rollers with tapered rollers, i.e. rollers having essentially the shape of a truncated cone
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/30—Parts of ball or roller bearings
    • F16C33/46—Cages for rollers or needles
    • F16C33/4617—Massive or moulded cages having cage pockets surrounding the rollers, e.g. machined window cages
    • F16C33/4623—Massive or moulded cages having cage pockets surrounding the rollers, e.g. machined window cages formed as one-piece cages, i.e. monoblock cages
    • F16C33/4635—Massive or moulded cages having cage pockets surrounding the rollers, e.g. machined window cages formed as one-piece cages, i.e. monoblock cages made from plastic, e.g. injection moulded window cages
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/30—Parts of ball or roller bearings
    • F16C33/66—Special parts or details in view of lubrication
    • F16C33/6637—Special parts or details in view of lubrication with liquid lubricant
    • F16C33/6659—Details of supply of the liquid to the bearing, e.g. passages or nozzles
    • F16C33/6674—Details of supply of the liquid to the bearing, e.g. passages or nozzles related to the amount supplied, e.g. gaps to restrict flow of the liquid
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C43/00—Assembling bearings
    • F16C43/04—Assembling rolling-contact bearings
    • F16C43/06—Placing rolling bodies in cages or bearings
    • F16C43/08—Placing rolling bodies in cages or bearings by deforming the cages or the races
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2300/00—Application independent of particular apparatuses
    • F16C2300/02—General use or purpose, i.e. no use, purpose, special adaptation or modification indicated or a wide variety of uses mentioned

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Rolling Contact Bearings (AREA)
  • Mounting Of Bearings Or Others (AREA)

Description

本発明は、円すいころ軸受に関する。   The present invention relates to tapered roller bearings.

円すいころ軸受は、同サイズの他の転がり軸受と比較して負荷容量が大きく、剛性が高いという特徴を有している。
図８は、従来の円すいころ軸受１００を示す縦断面図である。この円すいころ軸受１００は、内輪１０１と、外輪１０２と、複数の円すいころ１０３と、これら円すいころ１０３を周方向に間隔をあけて保持している環状の保持器１０４とを備えている（例えば、特許文献１参照）。 Tapered roller bearings are characterized by having a large load capacity and high rigidity compared to other rolling bearings of the same size.
FIG. 8 is a longitudinal sectional view showing a conventional tapered roller bearing 100. As shown in FIG. The tapered roller bearing 100 includes an inner ring 101, an outer ring 102, a plurality of tapered rollers 103, and an annular cage 104 holding the tapered rollers 103 at intervals in the circumferential direction (for example, , Patent Document 1).

保持器１０４は、軸方向一方側（図８では左側）の小径環状部１０５と、軸方向他方側（図８では右側）の大径環状部１０６と、これら環状部１０５，１０６を連結する複数の柱部１０７とを有している。そして、両環状部１０５，１０６の間であって周方向で隣り合う柱部１０７,１０７の間に形成される空間が、円すいころ１０３を収容するポケット１０８となる。   The cage 104 connects the small diameter annular portion 105 on one side in the axial direction (left side in FIG. 8), the large diameter annular portion 106 on the other side in the axial direction (right side in FIG. 8), and And the pillar portion 107 of the A space formed between the annular portions 105 and 106 and between the adjacent pillars 107 and 107 in the circumferential direction is a pocket 108 for accommodating the tapered rollers 103.

また、この円すいころ軸受１００（特許文献１に記載の発明）では、保持器１０４の小径環状部１０５の厚さ寸法（径方向寸法）を大きくし、内輪１０１と外輪１０２との間の環状の開口部１０９から軸受内部への潤滑油の浸入を抑制している。これにより、軸受内部における潤滑油の撹拌抵抗を低減することが可能となる。   Further, in the tapered roller bearing 100 (invention described in Patent Document 1), the thickness dimension (dimension in the radial direction) of the small diameter annular portion 105 of the cage 104 is increased, and the annular shape between the inner ring 101 and the outer ring 102 is formed. Infiltration of lubricating oil into the bearing from the opening 109 is suppressed. This makes it possible to reduce the stirring resistance of the lubricating oil inside the bearing.

特開２０１３−２２１５９２号公報JP, 2013-221592, A

図８に示すような円すいころ軸受１００の組み立ては、次のようにして行うことができる。まず、保持器１０４の各ポケット１０８に円すいころ１０３を収容した状態とする。保持器１０４の柱部１０７は、ポケット１０８に収容する円すいころ１０３の径方向外側への脱落を阻止しており、各円すいころ１０３が保持器１０４（ポケット１０８）に保持されている状態で、これらに内輪１０１を小径側から軸方向に沿って接近させ、円すいころ１０３を内輪１０１の内輪軌道面１０１ａに位置させる。   The assembly of the tapered roller bearing 100 as shown in FIG. 8 can be performed as follows. First, the tapered rollers 103 are accommodated in the pockets 108 of the cage 104. The column portion 107 of the cage 104 prevents the tapered rollers 103 housed in the pockets 108 from coming off in the radial direction, and in a state where each tapered roller 103 is held by the cage 104 (pocket 108), The inner ring 101 is made to approach these along the axial direction from the small diameter side, and the tapered roller 103 is positioned on the inner ring raceway surface 101 a of the inner ring 101.

円すいころ１０３を内輪軌道面１０１ａに位置させる途中では、円すいころ１０３の小径側部分１１０は、内輪１０１の小鍔部１０１ｂを乗り越えて径方向外側に変位する必要があるが、柱部１０７によりその変位が規制される。そこで、従来では、円すいころ１０３をポケット１０８に保持させた保持器１０４に対して、プレス等を用いて大きな力で内輪１０１を軸方向に押し付け、小径側部分１１０が小鍔部１０１ｂを乗り越える際に、保持器１０４を弾性変形（拡径）させ、円すいころ１０３を内輪軌道面１０１ａまで位置させている。これにより、内輪１０１、保持器１０４、及び円すいころ１０３が一体となった内輪ユニットが得られ、この内輪ユニットに、外輪１０２を組み付け、円すいころ軸受１００が完成する。   During the positioning of the tapered roller 103 on the inner ring raceway surface 101a, the small diameter side portion 110 of the tapered roller 103 needs to be displaced radially outward over the small ridge portion 101b of the inner ring 101. Displacement is regulated. Therefore, conventionally, the inner ring 101 is axially pressed with a large force using a press or the like against the cage 104 in which the tapered roller 103 is held in the pocket 108, and the small diameter side portion 110 passes over the small rib portion 101b. Then, the cage 104 is elastically deformed (diameter expansion), and the tapered roller 103 is positioned up to the inner ring raceway surface 101a. As a result, an inner ring unit in which the inner ring 101, the cage 104, and the tapered rollers 103 are integrated is obtained, and the outer ring 102 is assembled to the inner ring unit, and the tapered roller bearing 100 is completed.

しかし、前記のとおり、円すいころ１０３の小径側部分１１０が内輪１０１の小鍔部１０１ｂを乗り越える際、保持器１０４に無理な力が作用し、保持器１０４の寸法精度が低下したり、保持器１０４が破損したりする場合もある。つまり、保持器１０４に円すいころ１０３を保持させた状態で、内輪１０１を組み付けて行う円すいころの組み立ては容易でない。
特に図８に示す保持器１０４では、小径環状部１０５の厚さ寸法（径方向寸法）が大きくなっているため、弾性変形（拡径）し難く、この保持器１０４を備える軸受の組み立ては更に困難となる。 However, as described above, when the small diameter side portion 110 of the tapered roller 103 passes over the small ridge portion 101b of the inner ring 101, an excessive force acts on the cage 104, and the dimensional accuracy of the cage 104 decreases The 104 may be damaged. That is, in a state where the tapered roller 103 is held by the cage 104, the assembly of the tapered roller performed by assembling the inner ring 101 is not easy.
Particularly in the cage 104 shown in FIG. 8, since the thickness dimension (diameter direction dimension) of the small diameter annular portion 105 is large, it is difficult to elastically deform (diameter expansion), and the assembly of the bearing provided with this cage 104 is further It will be difficult.

そこで、本発明は、組み立てが容易となる円すいころ軸受を提供することを目的とする。   Then, an object of this invention is to provide the tapered roller bearing which an assembly becomes easy.

本発明の円すいころ軸受は、軸方向一方側に設けられ径方向外側に突出する小鍔部及び軸方向他方側に設けられ径方向外側に突出する大鍔部を有する内輪と、前記内輪の径方向外側に設けられている外輪と、前記内輪と前記外輪との間に設けられている複数の円すいころと、軸方向一方側の小径環状部、軸方向他方側の大径環状部、及び前記小径環状部と前記大径環状部とを連結している複数の柱部を有し、当該大径環状部と当該小径環状部との間であって周方向で隣り合う前記柱部の間に形成される空間が前記円すいころを保持するポケットとなる環状の保持器と、を備え、前記保持器は、前記ポケットに収容する前記円すいころの径方向外側への脱落を阻止するころ止め部を有し、前記小径環状部に、当該小径環状部の剛性を低下させるための凹部が設けられている。   The tapered roller bearing according to the present invention comprises an inner ring provided on one axial side and having a small ridge projecting outward in the radial direction and a large collar provided on the other axial side projecting outward in the radial direction, and a diameter of the inner ring , An outer ring provided on the outer side in the direction, a plurality of tapered rollers provided between the inner ring and the outer ring, a small diameter annular portion on one axial side, a large diameter annular portion on the other axial side, and A plurality of pillars connecting a small diameter annular portion and the large diameter annular portion, and between the large diameter annular portion and the small diameter annular portion, the circumferentially adjacent pillars being adjacent to each other And an annular cage in which a space to be formed is a pocket for holding the tapered roller, wherein the cage is a roller stopper for preventing the tapered roller, which is accommodated in the pocket, from coming off in the radial direction. And reduce the rigidity of the small diameter annular portion to the small diameter annular portion. Recess of the eye are provided.

円すいころ軸受の組み立てにおいて、保持器の各ポケットに円すいころを収容した状態とし、これと内輪とを軸方向から接近させて組み付ける際、円すいころの小径側部分が内輪の小鍔部を乗り越える必要がある。本発明では、円すいころはころ止め部により径方向外側への脱落が阻止されていることから、小鍔部を乗り越える際に、円すいころの小径側部分が径方向外側に変位して保持器の小径環状部側を径方向外側に変形させることになる。
特に、内輪と外輪との間の環状の開口部を塞ぐために、小径環状部の径方向寸法が大きい場合、小径環状部側は特に変形しにくくなり、保持器及び円すいころのユニットと、内輪との前記組み付けが困難になるおそれがある。
しかし、本発明では、小径環状部に、剛性を低下させるための凹部が設けられている。このため、小径環状部は撓みやすくなり、円すいころは保持器の小径環状部側を押して変形させ（弾性変形させ）小鍔部を乗り越えることができ、組み付けが容易となる。 In assembling tapered roller bearings, it is necessary to accommodate the tapered rollers in each pocket of the cage, and when assembling this with the inner ring close to each other from the axial direction, the small diameter side of the tapered rollers needs to go over the small collar of the inner ring There is. In the present invention, since the tapered roller is prevented from coming off radially outward by the roller stopper, when the small diameter portion of the tapered roller is displaced radially outward when passing over the small rib portion, the cage is not The small diameter annular portion side is deformed radially outward.
In particular, when the radial dimension of the small diameter annular portion is large in order to close the annular opening between the inner ring and the outer ring, the small diameter annular portion side is particularly hard to deform, and the cage and tapered roller unit and the inner ring There is a risk that the assembly of the
However, in the present invention, the small diameter annular portion is provided with a recess for reducing the rigidity. Therefore, the small diameter annular portion is easily bent, and the tapered roller can push and deform (elastically deform) the small diameter annular portion side of the cage, and can go over the small flange portion, which facilitates the assembly.

また、前記凹部は、前記小径環状部のうち、前記円すいころの小端面と対向する位置に設けられているのが好ましい。
この場合、保持器の小径環状部及びこの小径環状部と連続する柱部の一部は、径方向外側に向かって、より一層撓みやすくなり、前記組み付けが容易となる。
また、前記凹部は、前記小径環状部の軸方向一方側の軸受外部に向かって開口するようにして設けられていてもよい。 Preferably, the recess is provided at a position facing the small end face of the tapered roller in the small diameter annular portion.
In this case, the small diameter annular portion of the cage and a part of the pillar portion continuous with the small diameter annular portion are more easily bent radially outward, and the assembly becomes easy.
Further, the recess may be provided so as to open toward the outside of the bearing on one side in the axial direction of the small diameter annular portion.

また、前記凹部は、潤滑油を収容可能な空間として用いられるのが好ましい。
例えば、円すいころ軸受の回転が停止し、保持器の回転も停止すると、凹部に潤滑油が収容される。そして、円すいころ軸受が回転を再開すると、この凹部に収容されている潤滑油を潤滑に用いることができる。 Moreover, it is preferable that the said recessed part is used as space which can accommodate lubricating oil.
For example, when the rotation of the tapered roller bearing is stopped and the rotation of the cage is also stopped, the lubricating oil is contained in the recess. Then, when the tapered roller bearing resumes rotation, the lubricating oil contained in this recess can be used for lubrication.

本発明によれば、保持器の小径環状部は撓みやすい形状となり、内輪への組み付けの際に、円すいころは保持器の小径環状部側を径方向外側に押して変形させ小鍔部を容易に乗り越えることができ、その組み付けが容易となる。   According to the present invention, the small diameter annular portion of the cage has a flexible shape, and when assembled to the inner ring, the tapered rollers push the small diameter annular portion side of the cage radially outward to deform the small flange portion easily It is possible to get over, and its assembly becomes easy.

円すいころ軸受の実施の一形態を示す縦断面図である。It is a longitudinal cross-sectional view which shows one Embodiment of a tapered roller bearing. 保持器の一部を内径側から見た説明図である。It is explanatory drawing which looked at a part of holder | retainer from the internal-diameter side. 円すいころ軸受の一部を円すいころの中心線に平行な方向から見た模式図である。It is a schematic diagram which looked at a part of tapered roller bearing from the direction parallel to the central line of a tapered roller. 小径環状部及びその周囲を拡大して示す断面図である。It is sectional drawing which expands and shows a small diameter annular part and its periphery. 円すいころ軸受の組み立て手順を説明する説明図である。It is an explanatory view explaining an assembly procedure of a tapered roller bearing. 保持器の別の形態を示す縦断面図である。It is a longitudinal cross-sectional view which shows another form of a holder | retainer. 保持器の更に別の形態を示す縦断面図である。It is a longitudinal cross-sectional view which shows another form of a holder | retainer. 従来の円すいころ軸受を示す縦断面図である。It is a longitudinal cross-sectional view which shows the conventional tapered roller bearing.

〔円すいころ軸受の全体構成〕
図１は、本発明の円すいころ軸受１の実施の一形態を示す縦断面図である。この円すいころ軸受１は、内輪３と、この内輪３の径方向外側に設けられている外輪２と、これら内輪３と外輪２との間に設けられている複数の円すいころ４と、これら円すいころ４を保持している環状の保持器１０とを備えている。そして、この円すいころ軸受１は潤滑油（オイル）によって潤滑される。 [Overall configuration of tapered roller bearings]
FIG. 1 is a longitudinal sectional view showing an embodiment of the tapered roller bearing 1 of the present invention. The tapered roller bearing 1 includes an inner ring 3, an outer ring 2 provided radially outward of the inner ring 3, and a plurality of tapered rollers 4 provided between the inner ring 3 and the outer ring 2; And an annular cage 10 for holding the roller 4. And this tapered roller bearing 1 is lubricated by lubricating oil (oil).

内輪３は、軸受鋼や機械構造用鋼等を用いて形成された環状の部材であり、その外周には、複数の円すいころ４が転動するテーパー状の内輪軌道面３ａが形成されている。また、内輪３は、内輪軌道面３ａの軸方向一方側（図１では左側）に設けられ径方向外側に突出する小鍔部５と、内輪軌道面３ａの軸方向他方側（図１では右側）に設けられ径方向外側に突出する大鍔部６とを有している。   The inner ring 3 is an annular member formed using bearing steel, steel for machine construction, etc., and on the outer periphery thereof, a tapered inner ring raceway surface 3a on which a plurality of tapered rollers 4 roll is formed. . Further, the inner ring 3 is provided on one side (left side in FIG. 1) of the inner ring raceway surface 3a in the axial direction and protrudes radially outward, and the other side (right side in FIG. 1) of the inner ring raceway surface 3a. And a large flange portion 6 projecting radially outward.

外輪２も、内輪３と同様、軸受鋼や機械構造用鋼等を用いて形成された環状の部材であり、その内周には、複数の円すいころ４が転動するテーパー状の外輪軌道面２ａが形成されている。外輪軌道面２ａと内輪軌道面３ａとは対向した配置にある。   Similar to the inner ring 3, the outer ring 2 is also an annular member formed using bearing steel, steel for machine structural use, etc., and has a tapered outer ring raceway surface on which a plurality of tapered rollers 4 roll on its inner periphery. 2a is formed. The outer ring raceway surface 2a and the inner ring raceway surface 3a are arranged to face each other.

円すいころ４は、軸受鋼等を用いて形成された部材であり、内輪軌道面３ａと外輪軌道面２ａとを転動する。円すいころ４は、軸方向一方側に直径の小さい小端面４ａを有し、軸方向他方側に直径の大きい大端面４ｂを有している。大端面４ｂは、内輪３の大鍔部６の鍔面７と摺接する。   The tapered roller 4 is a member formed using bearing steel or the like, and rolls on the inner ring raceway surface 3a and the outer ring raceway surface 2a. The tapered roller 4 has a small end surface 4a with a small diameter on one side in the axial direction and a large end surface 4b with a large diameter on the other side in the axial direction. The large end face 4 b is in sliding contact with the heel surface 7 of the large collar portion 6 of the inner ring 3.

図２は、保持器１０の一部を内径側から見た説明図である。図１と図２において、保持器１０は、軸方向一方側の小径環状部１１、軸方向他方側の大径環状部１２、及び周方向に間隔をあけて設けられている複数の柱部１３を有している。小径環状部１１と大径環状部１２とは円環形状であり、軸方向に所定間隔離れて設けられている。柱部１３は、小径環状部１１と大径環状部１２とを連結している。そして、これら小径環状部１１と大径環状部１２との間であって周方向で隣り合う二つの柱部１３,１３の間に形成される空間が、円すいころ４を保持（収容）するポケット１４となる。   FIG. 2 is an explanatory view of a part of the holder 10 as viewed from the inner diameter side. In FIG. 1 and FIG. 2, the cage 10 has a small diameter annular portion 11 on one side in the axial direction, a large diameter annular portion 12 on the other side in the axial direction, and a plurality of pillars 13 spaced apart in the circumferential direction. have. The small diameter annular portion 11 and the large diameter annular portion 12 have an annular shape, and are provided at predetermined intervals in the axial direction. The column portion 13 connects the small diameter annular portion 11 and the large diameter annular portion 12. A pocket formed between the small diameter annular portion 11 and the large diameter annular portion 12 and between two adjacent pillars 13 in the circumferential direction holds (accommodates) the tapered roller 4 It becomes 14.

また、保持器１０は、ポケット１４に収容する円すいころ４の径方向外側への脱落（軸受の組み立ての際の脱落）を阻止するころ止め部１５を有している。図３は、円すいころ軸受１の一部を円すいころ４の中心線に平行な方向から見た模式図である。本実施形態のころ止め部１５は、柱部１３の径方向外側の部分からなる。図３に示すように、軸受中心線に直交する横断面において、一つのポケット１４を中央として周方向両側に位置する一対のころ止め部１５，１５間の周方向寸法Ｌ１は、その横断面における円すいころ４の直径Ｄ１よりも小さくなっている（Ｌ１＜Ｄ１）。このため、ポケット１４内の円すいころ４は、径方向外側に変位しようとすると、これら一対のころ止め部１５，１５に接触し、径方向外側へ脱落しない。   Further, the cage 10 has a roller stopper 15 that prevents the tapered roller 4 housed in the pocket 14 from coming off to the outside in the radial direction (dropping when assembling the bearing). FIG. 3 is a schematic view of a portion of the tapered roller bearing 1 as viewed in a direction parallel to the center line of the tapered roller 4. The roller stopper 15 of the present embodiment is formed of a radially outer portion of the column 13. As shown in FIG. 3, in a cross section perpendicular to the bearing center line, a circumferential dimension L1 between a pair of roller stoppers 15, 15 located on both sides in the circumferential direction centering on one pocket 14 is the cross section The diameter is smaller than the diameter D1 of the tapered roller 4 (L1 <D1). Therefore, when attempting to displace the tapered roller 4 in the pocket 14 radially outward, the tapered roller 4 contacts the pair of roller stoppers 15 and 15 and does not drop out radially outward.

また、この保持器１０は、ころ止め部１５が円すいころ４の外周面に接触することで、径方向についての位置決めがされる。更に、この保持器１０は（図１参照）、大径環状部１２が円すいころ４の大端面４ｂに接触することで、軸方向についての位置決めがされる。つまり、本実施形態の円すいころ軸受１では、保持器１０が転動体案内される軸受である。なお、保持器１０の径方向外側面（の一部）と、外輪２の内周面とが接触することで、保持器１０の径方向についての位置決めがされる構成であってもよい（つまり、径方向について外輪案内される軸受であってもよい。）   Further, the retainer 10 is positioned in the radial direction when the roller stopper 15 contacts the outer peripheral surface of the tapered roller 4. Further, the cage 10 (see FIG. 1) is positioned in the axial direction by the large diameter annular portion 12 coming into contact with the large end face 4 b of the tapered roller 4. That is, in the tapered roller bearing 1 of the present embodiment, the cage 10 is a bearing on which rolling elements are guided. In addition, the radial direction of the cage 10 may be positioned by contact of (a part of) the radially outer surface of the cage 10 with the inner circumferential surface of the outer ring 2 (that is, The bearing may be an outer ring guided in the radial direction.)

本実施形態の保持器１０は、樹脂製（合成樹脂製）であり、射出成形によって成形することができる。保持器１０は、潤滑油に対する耐性（耐油性）を備えさせるために、例えば、ポリフェニレンサルファイド樹脂（ＰＰＳ）等とすることができ、また、繊維強化樹脂（ＦＲＰ）とすることができる。このため、保持器１０は硬質となり比較的弾性変形しにくい。   The cage 10 of the present embodiment is made of resin (made of synthetic resin) and can be molded by injection molding. The cage 10 can be made of, for example, polyphenylene sulfide resin (PPS) or the like in order to provide resistance (oil resistance) to lubricating oil, and can be made of fiber reinforced resin (FRP). For this reason, the cage 10 is hard and relatively hard to elastically deform.

図１において、保持器１０は、内輪３と外輪２との間に形成されている環状空間（以下、軸受内部ともいう）に設けられており、各ポケット１４に一つの円すいころ４を収容し、複数の円すいころ４を周方向に等しい間隔をあけて配置し保持している。本実施形態の小径環状部１１は、外輪２の軸方向一方側の端部８（以下、外輪端部８ともいう。）と、内輪３の軸方向一方側の端部である小鍔部５との間に位置している。   In FIG. 1, the cage 10 is provided in an annular space (hereinafter, also referred to as the inside of a bearing) formed between the inner ring 3 and the outer ring 2, and accommodates one tapered roller 4 in each pocket 14. The plurality of tapered rollers 4 are arranged and held at equal intervals in the circumferential direction. The small diameter annular portion 11 of the present embodiment includes an end 8 on one axial side of the outer ring 2 (hereinafter, also referred to as an outer ring end 8) and a small ridge 5 that is an end on one axial side of the inner ring 3 It is located between

この円すいころ軸受１では、外輪２の内周面（外輪軌道面２ａ）が、軸方向一方側から他方側に向かって拡径している。このため、円すいころ軸受１（本実施形態では内輪３）が回転すると、内輪３と外輪２との間に形成されている環状空間を潤滑油が軸方向一方側から他方側に向かって流れる作用（ポンプ作用）が生じる。このような円すいころ軸受１の回転に伴うポンプ作用により、軸受外部の潤滑油が、軸方向一方側から、外輪２と内輪３との間の環状空間（軸受内部）に流入可能となり、流入した潤滑油は、軸方向他方側から流出する。つまり、潤滑油が軸受内部を通過する。   In the tapered roller bearing 1, the inner peripheral surface (the outer ring raceway surface 2 a) of the outer ring 2 is expanded in diameter from one axial side to the other side. For this reason, when the tapered roller bearing 1 (in the present embodiment, the inner ring 3) rotates, the lubricating oil flows in the annular space formed between the inner ring 3 and the outer ring 2 from one axial direction to the other (Pumping) occurs. By the pump action accompanying the rotation of such a tapered roller bearing 1, lubricating oil from the outside of the bearing can flow into the annular space (inside the bearing) between the outer ring 2 and the inner ring 3 from one side in the axial direction The lubricating oil flows out from the other side in the axial direction. That is, lubricating oil passes through the inside of the bearing.

図４は、小径環状部１１及びその周囲を拡大して示す断面図である。本実施形態の小径環状部１１は、外輪端部８の内周面２１に環状隙間Ａ１を有して対向する外側の環状面（以下、外環状面３１という。）を有している。また、この小径環状部１１は、小鍔部５の外周面２２に環状隙間Ａ２を有して対向する内側の環状面（以下、内環状面３２という。）を有している。
本実施形態では、外輪端部８の内周面２１及び小径環状部１１の外環状面３１は、円すいころ軸受１の中心線を中心とするストレート形状の円筒面からなり、また、小鍔部５の外周面２２及び小径環状部１１の内環状面３２は、前記中心線を中心とするストレート形状の円筒面からなる。 FIG. 4 is a cross-sectional view showing the small diameter annular portion 11 and the periphery thereof in an enlarged manner. The small diameter annular portion 11 of the present embodiment has an outer annular surface (hereinafter referred to as an outer annular surface 31) facing the inner circumferential surface 21 of the outer ring end portion 8 with an annular clearance A1. Further, the small diameter annular portion 11 has an inner annular surface (hereinafter referred to as an inner annular surface 32) facing the outer circumferential surface 22 of the small flange portion 5 with an annular gap A2.
In the present embodiment, the inner circumferential surface 21 of the outer ring end portion 8 and the outer annular surface 31 of the small diameter annular portion 11 are formed of straight cylindrical surfaces with the center line of the tapered roller bearing 1 as the center. The outer peripheral surface 22 of 5 and the inner annular surface 32 of the small diameter annular part 11 consist of a cylindrical surface of the straight form centering on the said center line.

外輪端部８の内周面２１と外環状面３１とは接近しており、径方向外側の環状隙間Ａ１の径方向寸法は微小（例えば、１ｍｍ未満）となるように設定されている。これにより、軸方向一方側の軸受外部に存在する潤滑油が、環状隙間Ａ１を通じて軸受内部に流入するのを抑制することができる。
また、小鍔部５の外周面２２と内環状面３２とは接近しており、径方向内側の環状隙間Ａ２の径方向寸法は微小（例えば、１ｍｍ未満）となるように設定されている。これにより、軸方向一方側の軸受外部に存在する潤滑油が、環状隙間Ａ２を通じて軸受内部に流入するのを抑制することができる。 The inner circumferential surface 21 of the outer ring end 8 and the outer annular surface 31 are close to each other, and the radial dimension of the annular gap A1 on the radially outer side is set to be small (for example, less than 1 mm). Thereby, it is possible to suppress that the lubricating oil existing outside the axial one side bearing flows into the inside of the bearing through the annular gap A1.
Further, the outer peripheral surface 22 of the small rib portion 5 and the inner annular surface 32 are close to each other, and the radial dimension of the annular gap A2 on the inner side in the radial direction is set to be minute (for example, less than 1 mm). Thereby, it is possible to suppress that the lubricating oil existing outside the axial one side bearing flows into the inside of the bearing through the annular gap A2.

以上より、小径環状部１１は、半径方向寸法について（大径環状部１２と比較して）大きくなっており、この小径環状部１１は、小鍔部５と外輪端部８との間に位置している。そして、小径環状部１１と小鍔部５との間に微小な環状隙間Ａ２が形成され、かつ、小径環状部１１と外輪端部８との間に微小な環状隙間Ａ１が形成されている。小鍔部５と外輪端部８との間には環状開口部が形成されるが、小径環状部１１は、この環状開口部を環状隙間Ａ１，Ａ２をあけて塞ぐ構成となっている。   From the above, the small diameter annular portion 11 is larger in radial dimension (compared to the large diameter annular portion 12), and the small diameter annular portion 11 is positioned between the small flange portion 5 and the outer ring end 8 doing. Then, a minute annular gap A2 is formed between the small diameter annular portion 11 and the small flange portion 5, and a minute annular gap A1 is formed between the small diameter annular portion 11 and the outer ring end portion 8. An annular opening is formed between the small flange portion 5 and the outer ring end 8, but the small diameter annular portion 11 is configured to close the annular opening with an annular gap A <b> 1 or A <b> 2.

図４において、小径環状部１１には、（第１の）凹部１７が設けられており、この凹部１７は小径環状部１１の剛性を低下させている。なお、図４に示す実施形態では、この第１の凹部１７の他に、第２の凹部１８も設けられている。第２の凹部１８については後に説明する。   In FIG. 4, the (first) concave portion 17 is provided in the small diameter annular portion 11, and the concave portion 17 reduces the rigidity of the small diameter annular portion 11. In the embodiment shown in FIG. 4, in addition to the first recess 17, a second recess 18 is also provided. The second recess 18 will be described later.

第１の凹部１７は、小径環状部１１の軸方向他方側の内側面３３に設けられている。つまり、第１の凹部１７は、小径環状部１１のうち、円すいころ４の小端面４ａと対向する位置に設けられており、この小端面４ａ側に向かって開口している。本実施形態の第１の凹部１７は、縦断面において、奥部が半円となる形状を有している。また、この凹部１７は、円環形状である小径環状部１１において、周方向に沿って連続した環状溝として形成されている。なお、凹部１７は、環状溝でなくてもよい。   The first recess 17 is provided on the other inner side surface 33 of the small diameter annular portion 11 in the axial direction. That is, the first recess 17 is provided at a position facing the small end face 4 a of the tapered roller 4 in the small diameter annular portion 11, and is opened toward the small end face 4 a side. The first concave portion 17 of the present embodiment has a shape in which the back portion is semicircular in the vertical cross section. Further, the concave portion 17 is formed as an annular groove continuous along the circumferential direction in the small diameter annular portion 11 having an annular shape. The recess 17 may not be an annular groove.

この第１の凹部１７により、小径環状部１１のうち、径方向外側分（外環状面３１）及び径方向内側部（内環状面３２）では軸方向の寸法が大きいが、径方向中央部では径方向外側部及び内側部と比較して軸方向寸法が小さくなり、この小径環状部１１の剛性を低下させている。
特に、第１の凹部１７は、円すいころ４の小端面４ａと対向する位置に設けられていることから、小径環状部１１のうち柱部１３との連結部１６側が拡径方向に撓みやすい（弾性変形しやすい）形状となる。 Of the small diameter annular portion 11, the first concave portion 17 has a large axial dimension at the radially outer portion (outer annular surface 31) and the radially inner portion (inner annular surface 32), but at the radially central portion The axial dimension is smaller than that of the radially outer portion and the inner portion, and the rigidity of the small diameter annular portion 11 is reduced.
In particular, since the first concave portion 17 is provided at a position facing the small end face 4 a of the tapered roller 4, the connecting portion 16 side with the column portion 13 in the small diameter annular portion 11 is easily bent in the radial direction ( It is easy to elastically deform.

そして、図４に示す小径環状部１１には、第２の凹部１８が設けられており、この凹部１８により小径環状部１１の剛性を更に低下させている。第２の凹部１８は、小径環状部１１の軸方向一方側の外側面３４に設けられている。つまり、第２の凹部１８は、小径環状部１１の軸方向一方側の軸受外部（図４では左側）に向かって開口するようにして設けられている。本実施形態の第２の凹部１８は、縦断面において、二つの直線による切り込み形状（Ｖ形状）を有している。また、この凹部１８は、円環形状である小径環状部１１において、周方向に沿って連続した環状溝として形成されている。   Then, a second recess 18 is provided in the small diameter annular portion 11 shown in FIG. 4, and the rigidity of the small diameter annular portion 11 is further reduced by the recess 18. The second recess 18 is provided on the outer side surface 34 on one side in the axial direction of the small diameter annular portion 11. That is, the second recess 18 is provided to open toward the outside (one side in FIG. 4) of the bearing on one side in the axial direction of the small diameter annular portion 11. The second recess 18 of the present embodiment has a cut shape (V shape) by two straight lines in the longitudinal cross section. Further, the concave portion 18 is formed as an annular groove continuous along the circumferential direction in the small diameter annular portion 11 having an annular shape.

この第２の凹部１８により、小径環状部１１のうち、径方向外側部（外環状面３１）及び径方向内側部（内環状面３２）では軸方向の寸法が大きいが、径方向中央部では径方向外側部及び内側部と比較して軸方向寸法が小さくなり、この小径環状部１１の剛性を更に低下させている。
特に、第２の凹部１８は、小径環状部１１の軸方向一方側の軸受外部（図４では左側）に向かって開口する形状を有していることから、小径環状部１１のうち柱部１３との連結部１６側が拡径方向に撓みやすい（弾性変形しやすい）形状となる。 Of the small diameter annular portion 11, the second recess 18 has a large axial dimension in the radially outer portion (outer annular surface 31) and the radially inner portion (inner annular surface 32), but in the radially central portion The axial dimension is smaller compared to the radially outer portion and the inner portion, and the rigidity of the small diameter annular portion 11 is further reduced.
In particular, since the second recess 18 has a shape that opens toward the outer side (left side in FIG. 4) of the bearing on one side in the axial direction of the small diameter annular portion 11, the pillar portion 13 of the small diameter annular portion 11 The connecting portion 16 side of the lens has a shape that is easily bent (elastically deformed) in the diameter expansion direction.

以上のような小径環状部１１に形成されている凹部１７（１８）の機能について説明する。なお、この機能（第１の機能）は、円すいころ軸受１の組み立ての際に発揮される。   The function of the recess 17 (18) formed in the small diameter annular portion 11 as described above will be described. This function (first function) is exhibited when assembling the tapered roller bearing 1.

図５は、図１に示す円すいころ軸受１の組み立て手順を説明する説明図である。図５（Ａ）において、円すいころ軸受１を組み立てる際、先ず、保持器１０と円すいころ４とを組み合わせて、これを内輪３に組み付ける（図５（Ｃ））。そこで、この組み付けの際、ポケット１４に収容されている円すいころ４の径方向外側への脱落を阻止する必要がある。そのために、本実施形態の保持器１０は、前記のとおり（図３参照）ころ止め部１５を有している。なお、円すいころ４の保持器１０への取り付けは、保持器１０の内周側から各ポケット１４に対して円すいころ４を入れて行われる。   FIG. 5 is an explanatory view for explaining an assembling procedure of the tapered roller bearing 1 shown in FIG. When assembling the tapered roller bearing 1 in FIG. 5 (A), first, the cage 10 and the tapered roller 4 are combined and assembled to the inner ring 3 (FIG. 5 (C)). Therefore, at the time of this assembly, it is necessary to prevent the tapered rollers 4 accommodated in the pockets 14 from falling off in the radial direction. For that purpose, the cage 10 of the present embodiment has the roller stopper 15 as described above (see FIG. 3). The tapered rollers 4 are attached to the cage 10 by inserting the tapered rollers 4 into the respective pockets 14 from the inner peripheral side of the cage 10.

円すいころ軸受１を組み立てるためには、前記のとおり、先ず、図５（Ａ）に示すように、保持器１０の各ポケット１４に円すいころ４を収容した状態として、この保持器１０及び円すいころ４のユニットと、内輪３とを軸方向に沿って接近させて組み付ける。この際、円すいころ４はころ止め部１５により径方向外側への脱落が阻止され、組み付けが容易となる。また、この組み付けの際、図５（Ｂ）に示すように、円すいころ４の小径側部分４９が内輪３の小鍔部５を乗り越える必要があり、円すいころ４の小径側部分４９が径方向外側に変位して保持器１０の小径環状部１１側の部分を径方向外側に変形させる必要がある。   In order to assemble the tapered roller bearing 1, as described above, first, as shown in FIG. 5A, with the tapered roller 4 housed in each pocket 14 of the cage 10, the cage 10 and the tapered roller are assembled. The unit 4 and the inner ring 3 are assembled close together in the axial direction. At this time, the tapered rollers 4 are prevented from coming off in the radial direction by the roller stoppers 15, and the assembly becomes easy. Further, at the time of this assembly, as shown in FIG. 5 (B), the small diameter side portion 49 of the tapered roller 4 needs to go over the small flange portion 5 of the inner ring 3 and the small diameter side portion 49 of the tapered roller 4 It is necessary to displace outward and to deform the portion on the small diameter annular portion 11 side of the cage 10 radially outward.

そこで、前記のとおり、小径環状部１１には凹部１７（１８）が形成されていることから、小径環状部１１は変形しやすい形状となっており、円すいころ４は小径環状部１１側の部分を径方向外側に押して弾性変形させ、小鍔部５を容易に乗り越えることができ、組み付けが容易となる。本実施形態では、小径環状部１１が変形容易であるため、プレスを用いることなく、作業者の力（手動）により組み付けが可能となる。   Therefore, as described above, since the recess 17 (18) is formed in the small diameter annular portion 11, the small diameter annular portion 11 has a shape that is easily deformed, and the tapered roller 4 is a portion on the small diameter annular portion 11 side. Can be elastically deformed by being pushed outward in the radial direction, and the small hook portion 5 can be easily climbed over, and the assembly becomes easy. In the present embodiment, since the small diameter annular portion 11 is easily deformed, the assembly can be performed by a worker's force (manually) without using a press.

そして、図５（Ｃ）に示すように、円すいころ４及び保持器１０が内輪３に組み付けられると、円すいころ４は、保持器１０によって径方向外側への移動が規制され、かつ、小鍔部５及び大鍔部６に引っかかり軸方向の移動も不能となるため、分解不能となる。このため、例えば、内輪３、円すいころ４及び保持器１０の内輪ユニット５０を、仮に床等に落下させても、これらがバラバラになるのを防ぐことが可能となる。   Then, as shown in FIG. 5 (C), when the tapered roller 4 and the cage 10 are assembled to the inner ring 3, the tapered roller 4 is restricted from moving radially outward by the cage 10, and the small roller As it is caught on the part 5 and the girdle part 6 and it becomes impossible to move in the axial direction, it becomes impossible to disassemble. For this reason, for example, even if the inner ring unit 50 of the inner ring 3, the tapered roller 4 and the retainer 10 is dropped to the floor or the like, it is possible to prevent them from falling apart.

そして、図示しないが、一体となっている内輪３、円すいころ４及び保持器１０の内輪ユニット５０と、外輪２とを軸方向に接近させて組み付けることで、円すいころ軸受１が構成される。   And although not shown in figure, the tapered roller bearing 1 is comprised by making the inner ring unit 50, the tapered roller 4 and the inner ring unit 50 of the cage 10, and the outer ring 2 which were united close to an axial direction, and assembling.

以上のように、本実施形態の円すいころ軸受１によれば、その組み立てにおいて、保持器１０の各ポケット１４に円すいころ４を収容した状態とし、これと内輪３とを軸方向から接近させて組み付ける際、円すいころ４はころ止め部１５により径方向外側への脱落が阻止され、組み付けが容易となる。そして、この組み付けの際、円すいころ４の小径側部分４９が内輪３の小鍔部５を乗り越える必要があるが、円すいころ４はころ止め部１５により径方向外側への脱落が阻止されていることから、小鍔部５を乗り越える際に、円すいころ４の小径側部分４９が径方向外側に変位して保持器１０の小径環状部１１側を径方向外側に変形させることになる。
特に、内輪３と外輪２との間の環状の開口部を塞ぐために小径環状部１１の径方向寸法を大きくしていることから、（仮に凹部１７，１８が存在しない場合には）小径環状部１１側は剛性が高く変形しにくくなり、保持器１０及び円すいころ４のユニットと、内輪３との前記組み付けが困難になる。
しかし、本実施形態では、小径環状部１１には、剛性を低下させるための第１の凹部１７が設けられている。このため、小径環状部１１は撓みやすくなり、円すいころ４は保持器１０の小径環状部１１側を径方向外側に押して変形させ（弾性変形させ）小鍔部５を容易に乗り越えることができ、組み付けが容易となる。 As described above, according to the tapered roller bearing 1 of the present embodiment, in the assembly, the tapered roller 4 is accommodated in each pocket 14 of the cage 10, and this and the inner ring 3 are made to approach from the axial direction At the time of assembly, the tapered roller 4 is prevented from coming off in the radial direction by the roller stopper 15, and the assembly becomes easy. And, at the time of this assembling, it is necessary for the small diameter side portion 49 of the tapered roller 4 to get over the small collar portion 5 of the inner ring 3, but the tapered roller 4 is prevented from falling off radially outward by the roller stopper 15 Therefore, when the small ridge portion 5 is passed over, the small diameter side portion 49 of the tapered roller 4 is displaced radially outward to deform the small diameter annular portion 11 side of the cage 10 radially outward.
In particular, since the radial dimension of the small diameter annular portion 11 is increased in order to close the annular opening between the inner ring 3 and the outer ring 2, the small diameter annular portion (if there is no recess 17 or 18) On the 11 side, the rigidity is high and the deformation is difficult, and the assembly of the unit of the cage 10 and the tapered roller 4 with the inner ring 3 becomes difficult.
However, in the present embodiment, the small diameter annular portion 11 is provided with the first recess 17 for reducing the rigidity. Therefore, the small diameter annular portion 11 is easily bent, and the tapered roller 4 can push the side of the small diameter annular portion 11 of the cage 10 radially outward to be deformed (elastically deformed) and easily get over the small ridge portion 5 Assembly becomes easy.

特に、第１の凹部１７は、小径環状部１１のうち、円すいころ４の小端面４ａと対向する位置に設けられていることから、小径環状部１１及びこの小径環状部１１と連続する柱部１３の一部は、径方向外側に向かって、より一層撓みやすくなり、前記組み付けが容易となる。
更に、本実施形態では、小径環状部１１に第２の凹部１８も設けられている。このため、小径環状部１１は、さらに撓みやすくなっており、前記組み付けの容易性に貢献することができる。
また、前記のとおり保持器１０は耐油性を高めるために、従来よりも硬質な樹脂製となっているが、凹部１７（１８）によって（凹部１７，（１８）が存在しない場合と比較して）小径環状部１１を撓みやすくすることができる。 In particular, since the first recess 17 is provided at a position facing the small end face 4 a of the tapered roller 4 in the small diameter annular portion 11, the small diameter annular portion 11 and a column portion continuous with the small diameter annular portion 11 A portion of 13 is more easily bent radially outward, and the assembly becomes easy.
Furthermore, in the present embodiment, the small diameter annular portion 11 is also provided with a second recess 18. For this reason, the small diameter annular portion 11 is more easily bent, and can contribute to the easiness of the assembly.
Further, as described above, the cage 10 is made of a harder resin than conventional to increase oil resistance, but the recess 17 (18) makes it possible (compared to the case where the recesses 17 and 18 do not exist). The small diameter annular portion 11 can be easily bent.

そして、このようにして組み立てられた円すいころ軸受１が、車両や各種機器の回転部に組み込まれた状態、つまり、円すいころ軸受１の使用状態において、この第１の凹部１７は、潤滑油を収容可能な空間として用いられる。例えば、円すいころ軸受１の回転が停止し、保持器１０の回転も停止すると、第１の凹部１７に潤滑油が収容される。そして、円すいころ軸受１の回転が再開されると、この凹部１７に収容されている潤滑油を潤滑に用いることができる。つまり、第１の凹部１７は、保持器１０が回転状態から停止すると、潤滑油を収容可能な空間として用いられる（凹部１７の第２の機能）。   Then, in the state where the tapered roller bearing 1 assembled in this manner is incorporated into the rotating part of a vehicle or various devices, that is, in the use state of the tapered roller bearing 1, the first concave portion 17 is lubricated with lubricating oil. It is used as a space that can be accommodated. For example, when the rotation of the tapered roller bearing 1 is stopped and the rotation of the cage 10 is also stopped, the lubricating oil is accommodated in the first recess 17. Then, when the rotation of the tapered roller bearing 1 is resumed, the lubricating oil contained in the recess 17 can be used for lubrication. That is, when the holder 10 is stopped from rotating, the first recess 17 is used as a space capable of containing lubricating oil (second function of the recess 17).

図６は、保持器１０の別の形態を示す縦断面図である。図１に示すように、前記実施形態では、小径環状部１１に第１の凹部１７と第２の凹部１８との双方が設けられている場合について説明したが、図６に示すように、第１の凹部１７のみであってもよい。この場合、小径環状部１１の外側面３４の形状のみが、図１に示す小径環状部１１と異なり、その他については同じ構成である。   FIG. 6 is a longitudinal sectional view showing another form of the holder 10. Although the case where both the first recess 17 and the second recess 18 are provided in the small diameter annular portion 11 has been described in the above embodiment as shown in FIG. 1, as shown in FIG. Only one recess 17 may be provided. In this case, only the shape of the outer side surface 34 of the small diameter annular portion 11 is different from the small diameter annular portion 11 shown in FIG.

また、図７は、保持器１０の更に別の形態を示す縦断面図である。図７に示すように、小径環状部１１には、（第２の）凹部１７のみが形成されていてもよく、また、その凹部１７の断面形状はＶ字形でなく、縦断面において、奥部が半円となる形状を有していてもよい。   Moreover, FIG. 7 is a longitudinal cross-sectional view which shows another form of the holder | retainer 10. As shown in FIG. As shown in FIG. 7, only the (second) concave portion 17 may be formed in the small diameter annular portion 11, and the cross sectional shape of the concave portion 17 is not V-shaped, and in the longitudinal cross section May have a semicircular shape.

以上のとおり開示した実施形態はすべての点で例示であって制限的なものではない。つまり、本発明の円すいころ軸受は、図示した形態に限らず本発明の範囲内において他の形態のものであってもよい。
凹部１７（１８）の形状は、図示した形態以外であってもよく、変更可能である。また、ポケット１４に収容する円すいころ４の径方向外側への脱落を阻止するころ止め部１５についても、他の形態であってもよい。 The embodiments disclosed above are illustrative and non-restrictive in every respect. That is, the tapered roller bearing of the present invention is not limited to the illustrated embodiment but may be another embodiment within the scope of the present invention.
The shape of the recess 17 (18) may be other than that illustrated, and can be changed. In addition, the roller stoppers 15 that prevent the tapered rollers 4 housed in the pockets 14 from falling outward in the radial direction may have another form.

１：円すいころ軸受 ２：外輪 ３：内輪
４：円すいころ ４ａ：小端面 ５：小鍔部
６：大鍔部 １０：保持器 １１：小径環状部
１２：大径環状部 １３：柱部 １４：ポケット
１５：ころ止め部 １７：第１の凹部 １８：第２の凹部 1: Tapered roller bearing 2: Outer ring 3: Inner ring 4: Tapered roller 4a: Small end face 5: Small ridge portion 6: Large ridge portion 10: Cage 11: Small diameter annular portion 12: Large diameter annular portion 13: Column portion 14: Pocket 15: Roller stopper 17: First recess 18: Second recess

Claims (3)

軸方向一方側に設けられ径方向外側に突出する小鍔部及び軸方向他方側に設けられ径方向外側に突出する大鍔部を有する内輪と、
前記内輪の径方向外側に設けられている外輪と、
前記内輪と前記外輪との間に設けられている複数の円すいころと、
軸方向一方側の小径環状部、軸方向他方側の大径環状部、及び前記小径環状部と前記大径環状部とを連結している複数の柱部を有し、当該大径環状部と当該小径環状部との間であって周方向で隣り合う前記柱部の間に形成される空間が前記円すいころを保持するポケットとなる環状の保持器と、を備え、
前記保持器は、前記ポケットに収容する前記円すいころの径方向外側への脱落を阻止するころ止め部を有し、
前記小径環状部の径方向中央部であって前記円すいころの小端面と対向する位置に、当該小径環状部の剛性を低下させるための凹部が設けられていて、
前記柱部は、前記凹部が設けられていている前記径方向中央部よりも径方向内側の部分とは繋がらず、当該径方向中央部よりも径方向外側の部分と繋がっていて、
前記小径環状部は、前記小鍔部の外周面に環状隙間を有して対向している、円すいころ軸受。 An inner ring provided on one side in the axial direction and having a small rib projecting outward in the radial direction and a large rib provided on the other side in the axial direction and projecting outward in the radial direction;
An outer ring provided radially outward of the inner ring;
A plurality of tapered rollers provided between the inner ring and the outer ring;
A small diameter annular portion on one side in the axial direction, a large diameter annular portion on the other side in the axial direction, and a plurality of column portions connecting the small diameter annular portion and the large diameter annular portion; And an annular cage, which is a pocket for holding the tapered roller, and a space formed between the pillars adjacent to each other in the circumferential direction with the small-diameter annular portion.
The cage has a roller stopper which prevents the tapered roller housed in the pocket from coming off radially outward.
A concave portion for reducing the rigidity of the small diameter annular portion is provided at a radial center portion of the small diameter annular portion and at a position facing the small end face of the tapered roller ,
The pillar portion is not connected to a portion radially inward of the radial center portion where the recess is provided, but is connected to a portion radially outer than the radial center portion.
The tapered roller bearing , wherein the small diameter annular portion is opposed to the outer circumferential surface of the small flange portion with an annular gap . 前記小径環状部に、当該小径環状部の剛性を低下させるために、前記凹部とは別の第二の凹部が更に設けられていて、
前記第二の凹部は、前記小径環状部の軸方向一方側の軸受外部に向かって開口するようにして設けられている請求項１に記載の円すいころ軸受。 In order to reduce the rigidity of the small diameter annular portion, the small diameter annular portion is further provided with a second concave portion different from the concave portion,
The tapered roller bearing according to claim 1, wherein the second concave portion is provided to open toward the outside of the bearing on one side in the axial direction of the small diameter annular portion. 前記円すいころの前記小端面と対向する位置に設けられている前記凹部は、潤滑油を収容可能な空間として用いられる請求項１又は２に記載の円すいころ軸受。 The tapered roller bearing according to claim 1 or 2 , wherein the recess provided at a position facing the small end face of the tapered roller is used as a space capable of containing lubricating oil.
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